From: Narbik Kocharians (narbikk@gmail.com)
Date: Sat May 05 2007 - 04:39:12 ART
The benefit of this command is that if you negate it and then set your hold
timer let's say to 10 minutes or any desired and appropriate value, if the
directly connected link goes down, the router will not loose any of its
routes that it learned from that neighbor. The routes are in the BGP table
but not in the routing table.
On 5/4/07, Petr Lapukhov <petr@internetworkexpert.com> wrote:
>
> Hi,
>
> Basically, "bgp fast-external-fallover" is router process global command
> and
> is only
> intended to work with "external" and "directly connected" BGP peers. The
> idea
> is to reset eBGP session as soon as interface goes down, and not to rely
> on
> keepalive
> timers. The command is enabled by default.
>
> Next, there is a *per-interface* command "ip bgp fast-external-fallover"
> which activates
> or deactivates "external-fallover" trigger on interface. You may use this
> command
> to selectively disable external fallover trigger on a given interface.
>
> Finally we come to "neighbor fallover" which is the most "modern" command.
> It is
> intended to be used with *iBGP* or *eBGP* peers, and triggers fallover
> when
> IGP
> losts route to a peer (not just when interface flaps).
>
> HTH
>
> --
> Petr Lapukhov, CCIE #16379 (R&S/Security)
> petr@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
>
> 2007/5/5, ccie anees <ccieanees@yahoo.com>:
> >
> > Hi,
> >
> > What is the difference between bgp fast-external-fallover and the
> just
> > neighbor <ip> fall-over command?
> >
> > Thanks,
> >
> > Anees.
> >
> >
> > ---------------------------------
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> > Check outnew cars at Yahoo! Autos.
> >
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-- Narbik Kocharians CCIE# 12410 (R&S, SP, Security) CCSI# 30832 Network Learning, Inc. (CCIE class Instructor) www.ccbootcamp.com (CCIE Training)
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